AX99100QF datasheet(13/70 Pages) ASIX

13 / 70 page

AX99100

PCIe to Multi I/O Controller

1.4.3

Serial Interface for Multi-Protocol Transceiver

Table 1-6: Serial Interface for Multi-Protocol Transceiver Pin Description

Serial interface for Multi-Protocol Transceiver

Pin Name

Type

Pin No

Pin Description

TXD1

TXD2

TXD3

TXD4

O5/4m

Transmit data output to transceiver or IrDA data output to IR LED

DXEN1

DXEN2

DXEN3

DXEN4

B5/PD/4m

Driver Enable

These pins have internal pull-down during reset. If there is the external pull-up

resisters connected to these pins separately, it will work for RS-232 function with

active low. Otherwise, it will work for RS-485 function with active high and the

output can be enabled by register (the default is disabled). Please reference to

Section3.2.

RTS1

RTS2

RTS3

RTS4

O5/4m

Request to send (Active Low)

RXD1

RXD2

RXD3

RXD4

O5/PU/4m

Serial received data input from transceiver or IrDA data input from IrDA

detector.

485EN1

485EN2

485EN3

485EN4

O5/4m

Interface Selection

1: RS-485 selected

0: RS-232 selected

485TE1

485TE2

485TE3

485TE4

O5/4m

RS485 Termination Enable for transceiver.

RXEN1

RXEN2

RXEN3

RXEN4

O5/4m

Receiver Enable

1: Enable Receiver

0: Disable Receiver

Note: Software should enable RS-485 function for the corresponding ports first.

CTS1

CTS2

CTS3

CTS4

Clear to send (Active Low)

Note 1: Serial Port 1 and 2 are only valid when CHIP_MODE = 010, 100 and 111.

Note 2: Serial Port 3 and 4 are only valid when CHIP_MODE = 101 and 111.

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